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A 10-gallon hat demonstrates the idea of volume and aids readers in learning measurements. Other fun examples and cool facts will engage readers in learning this important math concept. With an introduction to the simple formula for finding volume, this book's colorful photographs and illustrations will guide readers through the ways length and height are tied to volume and the different units used to express this measurement. Whether solving for an exact volume or estimating, readers will learn about regular and irregular 3-D shapes, and reinforce their comprehension with a concluding hands-on activity.